Malicious PDF — malware analysis report

Static analysis result for SHA-256 95153e4cd5fcde11…

MALICIOUS

PDF

75.8 KB Created: 2021-09-13 18:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a5f8412759ab459a28f375ee027d067f SHA-1: 1708cb02f256c2f0ce9e90d1a3da854fde780d49 SHA-256: 95153e4cd5fcde11f9bd494db6b8458078df0b570987e654c5a12780967427f7
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF phishing trojan by ClamAV and an ML classifier. A high-severity heuristic indicates it uses a browser extension installation lure to trick users into compromising their systems. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to lead users to malicious sites that likely host further exploits or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://konzolstudio.ro/uploaded_files/file/59299115300.pdf In PDF document text
    • http://alibabashipping.com/userfiles/file/riwewo.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/mijibedisibekigesode.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/lepuxexefoko.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-2/20210902215102257908.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/bilutiwo.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/15053134873.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/21873030897.pdfIn PDF document text
    • http://baozhaopharm.com/upload/files/67385804185.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/84573924832.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/38380000203.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/gosarapajalavosemak.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/24879644767.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/36961341982.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/latunisowokewubed.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16136b70186bef---99711719724.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/53875045359.pdfIn PDF document text
    • http://dakov.hu/_user/file/pipuliridi.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133bbc8ebfca---21205651138.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f013ec3628---12990117900.pdfIn PDF document text
    • http://partnercable.com/files/jejoxusirinadeb.pdfIn PDF document text
    • http://fitviewer.com/files/file/voravodotewulexaguzimusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+watch+hbo+max+on+a+firestickPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC404 16940 bytes
SHA-256: de9201ac36bf6ab6e360bfa2473bfee26fae24fb29cbe61ca8f3025d99e2c4a1
font_01_sfnt_off0000f00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00D 10964 bytes
SHA-256: f912558b40dedcee7f6fdb0564c2ed4f635d1f8161f7e8a46f0c514971846dcb
font_02_sfnt_off00010962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1